/* ==========================================================================
   ViralTools — Master Design System (Mobile-First & Performance-Optimized)
   ========================================================================== */

:root {
  /* Color Palette - White / Light Mode (Default) */
  --bg-main: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #ffffff;
  --bg-tag: #eef2ff;
  --bg-result: #f0fdf4;
  --border-color: #e2e8f0;
  --border-focus: #4f46e5;
  --border-result: #86efac;

  /* Typography Colors */
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #94a3b8;
  --text-tag: #4338ca;
  --text-result: #14532d;

  /* Brand Accents */
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-glow: rgba(79, 70, 229, 0.12);
  --success: #10b981;
  --success-hover: #059669;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.06);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.15);

  /* Layout */
  --max-width: 1200px;
  --header-height: 64px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --bg-main: #090d16;
  --bg-card: #111827;
  --bg-card-hover: #1f2937;
  --bg-input: #1e293b;
  --bg-tag: #1e1b4b;
  --bg-result: #064e3b;
  --border-color: #1f2937;
  --border-focus: #818cf8;
  --border-result: #059669;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  --text-tag: #a5b4fc;
  --text-result: #d1fae5;

  --primary: #6366f1;
  --primary-hover: #818cf8;
  --primary-light: #1e1b4b;
  --primary-glow: rgba(99, 102, 241, 0.25);

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 20px -3px rgb(0 0 0 / 0.5);
}

/* Reset & Base Elements */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

/* Icons */
.icon {
  width: 20px;
  height: 20px;
  display: inline-block;
  vertical-align: middle;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.icon-lg {
  width: 28px;
  height: 28px;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 1rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.logo-badge {
  background: linear-gradient(135deg, var(--primary), #818cf8);
  color: #ffffff;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px var(--primary-glow);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  background: var(--bg-card-hover);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-icon:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-1px);
}

/* Search Bar in Header */
.quick-search-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.85rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.88rem;
  cursor: pointer;
  transition: var(--transition);
}

.quick-search-btn:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.kbd-shortcut {
  background: var(--border-color);
  font-size: 0.75rem;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  display: none;
}

/* Hero Section */
.hero-section {
  padding: 3rem 0 2rem;
  text-align: center;
  background: radial-gradient(circle at 50% 10%, var(--primary-glow) 0%, transparent 60%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.85rem;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-main) 30%, var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 2rem;
}

/* Search Box (Hero) */
.hero-search-wrapper {
  max-width: 640px;
  margin: 0 auto 1.5rem;
  position: relative;
}

.search-input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon-inside {
  position: absolute;
  left: 1.25rem;
  color: var(--text-light);
  pointer-events: none;
}

.search-input-main {
  width: 100%;
  padding: 1rem 1rem 1rem 3.2rem;
  font-size: 1.05rem;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-main);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.search-input-main:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

/* Search Auto-suggest Dropdown */
.search-results-dropdown {
  position: absolute;
  top: 105%;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  max-height: 380px;
  overflow-y: auto;
  display: none;
  text-align: left;
}

.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: var(--bg-card-hover);
}

.search-result-meta {
  display: flex;
  flex-direction: column;
}

.search-result-title {
  font-weight: 600;
  color: var(--text-main);
}

.search-result-category {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Category Pills Bar */
.category-pills-bar {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.5rem 0 1rem;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.category-pills-bar::-webkit-scrollbar {
  display: none;
}

.cat-pill {
  white-space: nowrap;
  padding: 0.45rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}

.cat-pill:hover, .cat-pill.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 2px 6px var(--primary-glow);
}

/* Sections */
.section {
  padding: 3rem 0;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.75rem;
}

.section-title-wrap h2 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.view-all-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: var(--transition);
}

.view-all-link:hover {
  transform: translateX(3px);
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.tool-card-top {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.tool-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tool-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.3rem;
}

.tool-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem;
}

.category-tag {
  background: var(--bg-tag);
  color: var(--text-tag);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.78rem;
}

.usage-badge {
  color: var(--text-light);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}

.category-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cat-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.cat-info h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.cat-info p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Feature Highlights ("Why Choose Us") */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: left;
}

.feature-icon-circle {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Tool Application Page Layout */
.tool-page-wrapper {
  padding: 1.5rem 0 3rem;
}

/* Breadcrumb */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  overflow-x: auto;
  white-space: nowrap;
}

.breadcrumb-nav a:hover {
  color: var(--primary);
}

.breadcrumb-sep {
  color: var(--text-light);
}

/* Tool Header */
.tool-header {
  margin-bottom: 1.75rem;
}

.tool-header h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.tool-header p {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Privacy Guarantee Banner */
.privacy-badge-banner {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-result);
  color: var(--text-result);
  border: 1px solid var(--border-result);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 0.75rem;
}

/* Interactive Tool Card */
.tool-app-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
}

/* Form Controls */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.98rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

textarea.form-control {
  min-height: 140px;
  resize: vertical;
  line-height: 1.5;
  font-family: inherit;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card-hover);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: var(--border-color);
}

.btn-success {
  background: var(--success);
  color: #ffffff;
}

.btn-success:hover {
  background: var(--success-hover);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* Result Box */
.result-box {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-result);
  border: 1px solid var(--border-result);
  border-radius: var(--radius-md);
  color: var(--text-result);
  display: none;
  animation: fadeIn 0.3s ease;
}

.result-box.active {
  display: block;
}

.result-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-main-value {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0.5rem 0;
  word-break: break-word;
}

.result-details-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-result);
  font-size: 0.92rem;
}

.result-stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.result-stat-item span:first-child {
  color: var(--text-muted);
}

.result-stat-item span:last-child {
  font-weight: 600;
  color: var(--text-main);
}

/* Canvas / Image Preview Zone */
.image-preview-zone {
  margin: 1.25rem 0;
  text-align: center;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  background: var(--bg-card-hover);
  position: relative;
  overflow: hidden;
}

.image-preview-zone img, .image-preview-zone canvas {
  max-width: 100%;
  max-height: 420px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

/* SEO Content Section */
.seo-content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
}

.seo-content-card h2 {
  font-size: 1.4rem;
  font-weight: 750;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-main);
}

.seo-content-card h2:first-child {
  margin-top: 0;
}

.seo-content-card h3 {
  font-size: 1.15rem;
  font-weight: 650;
  margin: 1.25rem 0 0.5rem;
}

.seo-content-card p {
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.seo-content-card ul, .seo-content-card ol {
  margin-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

.seo-content-card li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

/* Formula Box */
.formula-box {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-family: monospace;
  font-size: 1rem;
  color: var(--primary);
  margin: 1rem 0 1.5rem;
}

/* FAQs Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.1rem 1.25rem;
  background: none;
  border: none;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  gap: 1rem;
}

.faq-icon-arrow {
  transition: transform 0.25s ease;
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  transition: max-height 0.3s ease-in-out;
  padding-bottom: 1.25rem;
}

/* Advertisement Placeholders */
.ad-slot {
  margin: 2rem auto;
  text-align: center;
  padding: 1.25rem;
  background: var(--bg-card-hover);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  min-height: 90px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2rem;
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
  transform: translateX(2px);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-light);
  font-size: 0.85rem;
  text-align: center;
}

/* Mobile Bottom Navigation Bar */
.mobile-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-around;
  z-index: 90;
  box-shadow: 0 -2px 10px rgb(0 0 0 / 0.05);
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem 0.75rem;
  transition: var(--transition);
}

.mobile-nav-item.active, .mobile-nav-item:hover {
  color: var(--primary);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 80px;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: #0f172a;
  color: #f8fafc;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: slideUp 0.25s ease;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* Tablet & Above (768px) */
@media (min-width: 768px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .nav-links {
    display: flex;
  }
  .kbd-shortcut {
    display: inline-block;
  }
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-grid {
    grid-template-columns: 2fr repeat(3, 1fr);
  }
  .footer-bottom {
    flex-direction: row;
    text-align: left;
  }
  .form-row.two-col {
    grid-template-columns: repeat(2, 1fr);
  }
  .form-row.three-col {
    grid-template-columns: repeat(3, 1fr);
  }
  .result-details-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .mobile-bottom-nav {
    display: none;
  }
}

/* Desktop & Large Screens (1024px) */
@media (min-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Extra Large Screens (1280px) */
@media (min-width: 1280px) {
  .hero-title {
    font-size: 3.2rem;
  }
}